The idea that international politics can be a theoretical science logically homeomorphic to theoretical physics finds its most perspicuous recent expression in a methodological falsificationist program for its realization. But the program is a syllabus of epistemological errors which, upon detailed examination, collapses into incoherence. This article gives particular attention to three aspects of the program: the principle of interdependent deduction, the falsifiability criterion and the critical testing policy. Despite the systematic and resolute efforts on the part of its adherents to fix a methodological grammar for international studies, the program of methodological falsificationism is revealed to be: essentially a complete failure. The main source of the difficulty is located in the failure to appreciate the role of metaphysics in the sciences which, contrary to the standard positivist-empiricist view, constitutes the driving force behind scientific discoveries. Since a monistic metaphysics, however, may be neither possible nor desirable for the social and political sciences, a deconstructive metaphysical program is recommended. The final conclusion that vastly increased attention needs to be given to ontological and metaphysical issues seems completely warranted.